Originally Posted by
Jhieminga
You will run into some confusion no doubt, which is why Istanbul has used a slightly different version and uses three sets of numbers for five runways.
Yes, IST has three groups of runways (with, from W to E, 2, 2, and 1 runways) separated by terminals between each group. So there's no scope for a C runway designation, therefore three separate runway direction designations are used.